Source: Quarterly financial reports with the Securities and Exchange Commission, or if necessary, statements signed by company officials and provided to NGI.

Companies providing data directly to NGI include Bp plc, Chevron, ConocoPhillips, Louis Dreyfus Energy Services, Merrill Lynch, Shell Energy North America and Tenaska Marketing Ventures. *BP plc did not participate in the quarterly survey prior to 4Q2007. **Chevron’s data for both years represent U.S. sales only.

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